High-Frequency Low-Noise Voltage-Controlled LC-Tank Oscillators Using a Tunable Inductor Technique(<Special Section>Novel Device Architectures and System Integration Technologies)

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概要

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• This paper describes 3-GHz and 7-GHz tunable-inductance LC-tank voltage-controlled oscillators (VCOs) implemented in 0.18-μm CMOS technology. Unlike the traditional tuning method by a varactor, a tunable inductor is employed in the VCO by using a transformer to compensate for the energy loss. The VCO facilitates the tuning frequency and low noise of the output signals, together with a variable inductor which satisfies both criteria. The 3-GHz VCO using a symmetry transformer provides the tuning range of 2.85 to 3.12GHz at 1-V supply. The power consumption is 4.8mW while the measured phase noise is -126dBc/Hz at 1-MHz offset from a 2.85-GHz carrier. A small-area stacked transformer is employed in the 7-GHz VCO, which achieves a tuning range of 6.59 to 7.02GHz and measured phase noise of -114dBc/Hz at 1-MHz offset from a 6.59-GHz carrier while consuming 9mW from a 1.2-V supply.

• 社団法人電子情報通信学会の論文
• 2006-11-01

著者

• Yang Ching-yuan

  Department Of Electrical Engineering National Chung Hsing University

• Tsai Meng-ting

  Department Of Electrical Engineering National Chung Hsing University

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• High-Frequency Low-Noise Voltage-Controlled LC-Tank Oscillators Using a Tunable Inductor Technique(Novel Device Architectures and System Integration Technologies)

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